enclosure

enclosureen‧clo‧sure /ɪnˈkləʊʒə $ -ˈkloʊʒər/ noun1[countable]TBC an area surrounded by a wall or fence, and used for a particular purposethe bear enclosure at the zoo2[uncountable]TBC the act of making an area separate by putting a wall or fence around itthe enclosure of arable land for pasture3[countable]TCM something that is put inside an envelope with a letter